bosnjo
Registered user
There is nothing stopping it from falling into the tunnel.
Lost Swinging Arm Rubber Venting Plug
- Thread starter gsman1
- Start date
There is nothing stopping it from falling into the tunnel.
Mines in for service Feb and has 39,000 on her now, told me they will just replace the shaft at that mileage, but deffo asking for lock thread to be put onto the "famous" bung. 
TD.
TD.
How many tens of thousands of euros did these clowns spend designing this 'fix' that seems to have an almost guaranteed failure rate.
Did nobody during this process realise that perhaps a proper double lip would be a better idea like just about every other rubber grommit in the world
Did nobody during this process realise that perhaps a proper double lip would be a better idea like just about every other rubber grommit in the world
bosnjo
Registered user
Double lip was also the first thing that came to my mind. As a result, I've decided to look for the valve elsewhere, that has a double lip, and replace it next time I lube the splines. That was a moment I discovered that those "valves" exist for other purpose, to be installed inside the piping joints, usualy for water and other liquids drainage, and serve only as a one-way valves so the liquid cannot return through the same pipe. Then, they are all produced just the way we see it on the photo above and vary in sizes, from the size used on our bikes to huge ones. The only lip has a groove in the piping joint so the other lip would simply be on the way and make impossible to close the joint.
Now you must be asking, what does it have to do with motorcycle????
Well, it does have to do a lot as BMW didn't design and produce specific valve. They simply use what's on the market and ordered valves by quantity at some manufacturer that makes them for piping.
I think a bit of wire stuck through that will stop it falling in.
If the rubber venting plug falls inside are you all still using the bike?
Any concern with it inside the housing??
Thanks
Any concern with it inside the housing??
Thanks
3bikesnospace
Registered user
It's a tiny rubber bung, will have zero impact on a massive spinning steel shaft ��
A tiny small rubber item vs a rotating steel shaft represent as much a threath as throwing a banana into a monkey pit..
I am looking at a cost to redesign these myself and get a batch made which can be fitted from outside and have a flange so it cannot fall inside.
I know the hole diameter is 10 mm but does anyone know the wall thickness of the housing, therefore the gap between the flanges on the rubber valve.
Dan
I know the hole diameter is 10 mm but does anyone know the wall thickness of the housing, therefore the gap between the flanges on the rubber valve.
Dan
That's a good idea, sorry cant help with the wall thickness as mines not been done yet. I'll be down for one if you manage to get something sorted.
bosnjo
Registered user
I looked for it all over the internet but there is no plug with two flanges I could find.
Measure distance between inside flange and small outside ridge on bung, will give you thickness measurement .
QUOTE=captaindan;6426997]I am looking at a cost to redesign these myself and get a batch made which can be fitted from outside and have a flange so it cannot fall inside.
I know the hole diameter is 10 mm but does anyone know the wall thickness of the housing, therefore the gap between the flanges on the rubber valve.
Dan[/QUOTE]
QUOTE=captaindan;6426997]I am looking at a cost to redesign these myself and get a batch made which can be fitted from outside and have a flange so it cannot fall inside.
I know the hole diameter is 10 mm but does anyone know the wall thickness of the housing, therefore the gap between the flanges on the rubber valve.
Dan[/QUOTE]
Attachments
Like these ones discussed here>
https://www.ukgser.com/forums/showt...nical-Recall?p=6336500&viewfull=1#post6336500
At the risk of asking the obvious, why don't you just glue the bungs in?
Hi Hann, Yes i do mean like that.
There are no end of Chinese copies of these little valves, but to guarantee a good fit i would rather commission some myself.
I’ll take my plug out and see if i can get a measurement. After that i will post as and when i manage to get some done.
Dan
The 1mm flange at the top means a 1mm pool left in the housing. Comically bad design.
Maybe not a problem as the venturi effect of the air flow pass the slit will tend to 'drag' most of the water out surely?
The airflow past a closed rubber slit will create venturi effect??? You should join the BMW team
So this rubber valve is basically there because the final drives have a moisture ingress issue that causes corrosion to the inadequately lubricated shaft joint, a typical BMW bodge to fix a problem that should not have been there in the first instance .
Think lc front fork failures and numerous other similar issues in the past 15 or 20 years
Think lc front fork failures and numerous other similar issues in the past 15 or 20 years
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